I tried a different phone, since I cannot downgrade from iOS 11 anymore on the previous device.
Got an iPhone 5s running iOS 10.3.1. - went for this version since I noticed this is what the Kobiton devices were running.
Adjusted webDriver build settings to this iOS version, clean, build.
Trusted both ways, ran the test with the same outcome, not listening on USB. Last line is again the server url, which is confirmed as the iPhone’s ip.
Katalon picked it up as a local device.

Since I don’t want to update this phone too just to prove a theory, my best guess is that Katalon needs some work on iOS 11.x support and fast, since any iOS version older than 11 is not getting signed by Apple anymore.

When earlier I executed the test cases 20 days back then device is displayed on the list. Below are the tools version I was using:
iOS version : 10 + but less than 11
X Code version : 8 + but less than 9
Appium version : 1.6
Katalon Version : 4.7, 4.8

We’ve investigated and will apply a support for iOS 11 in the next release. Looks like the current mobile core of Katalon Studio does not handle iOS 11 fully, so that’s why you can’t see iOS 11 devices listed.

I am having this exact issue as well with Real devices running both above and below IOS 11. Devices are found and tests can be run in XCODE without issue on the real devices. However, only simulators are appearing in Katalon…not the real devices.

One of the first things you can do is see if the device is recognized by command line tools outside of Xcode:

idevice_id -l

If that does show your device, then it could be that you don’t have permissions to run some of the other command line tools that Katalon (and Appium behind the scenes) require. You can reinstall those tools with: